Figure 5-16 -Figure 5-16 Shows Adam's Purchases of Bananas and Apples When

Figure 5-16

-Figure 5-16 shows Adam's purchases of bananas and apples when apples cost $5 each and bananas $4 each.The information implies that Adam's income

A) must be $9.
B) must be $20.
C) must be $40.
D) Adam's income cannot be determined without further information.